114 [August 



anteriorly ; third segment often with a small yellow spot on each side at 

 tip, sometimes reduced to a mere dot, and sometimes entirely wanting ; 

 the third and following segments deeply incised at base; venter imma- 

 culate. Length 5J — 10 lines ; expanse of wings 9 — 15 lines. 



MdJfi. — Resembles the female, but differs as follows : — the mark on 

 each side of the face is larger and elongate, the clypeus has a large 

 suborbicular, yellowish-white mark, often much reduced or entirely 

 wanting ; the clypeus has the lateral fringe golden-yellow, very bril- 

 liant in certain lights ; the tegulae has a yellowish-white spot, rarely 

 wanting; the wings are clearer; the band on the second segment of 

 the abdomen is of equal width and not narrowed on the anterior 

 middle ; the four following segments have each a narrow fascia, often 

 more or less interrupted, and sometimes obsolete, especially in the 

 middle ; sometimes the abdomen is marked as in the female, with 

 the lateral spot on the third segment always present. Length 5 — 64 

 lines; expanse of wings 8 — 91 lines. 



Hah. — Massachusetts (Ridings); Delaware (Dr. Wilson); Illinois 

 (Walsh); Louisiana (Kennicott). Coll. Eut. Soc. Philad., and Chicago 

 Academy of Sciences. 



Seventeen 9 . fourteen % specimens. Easily recognized by the 

 blackish wings, and the broad pale yellowish band on the second ab- 

 dominal seo-ment. The females vary much in size. 



2. Cerceris clypeata, Dahlb. 



Cerceris clypeata, Dahlb., Hym. Europ. i, p. 221. 

 Black ; face more or less, two spots on collar, postscutellum, spot on each 

 side of first abdominal segment in J , broad band on second, narrow apical 

 margins of remaining segments except last, and jsart of legs, yellow: wings 

 dusky. 



Fnnald. — Black, opaque, closely and strongly punctured, clotheil 

 with a short palish pubescence; on each side of the face a longitudinal, 

 more or less developed, orbital yellow mark ; the carina between the 

 antennae sharply defined, sometimes with a minute yellowish spot or 

 line above the clypeus. sometimes there is a yellow spot behind the 

 eyes near their summit; clypeus more or less produced in the middle, 

 sometimes greatly so. the upper surface moderately convex, the lower 

 concave, the apical margin truncated, arcuated, or more or less emargi- 

 nated, the lateral angles sometimes subacute ; above, there is a trans- 

 verse yellow spot, sometimes covering the entire surface, sometimes 

 much reduced, sometimes there is a yellow spot beneath; lateral lobes 

 sometimes with a yellow spot on each extreme side, and an apical 

 fringe of palish pubescence ; mandibles black or piceous-black, more 



